The Olines not worse but it does look worse if that makes any sense.
Jones isn't the same back this season. The fire and burst he played with last year made the oline appear better than it was. There are more theories on this than there are posters here so I won't even try to explain my thoughts.
Bledsoe also makes Olines look worse than they are. He always has. He has some of the worst in pocket mobility I've ever seen. He's huge and hard to bring down, but he never steps up, over, back whatever to get the pass off. He takes sacks that even poor ol' Vinny avoided.
Throw in blockers other than the Oline like Witten who has seemed to regress as a blocker this year (personal opinion is that being taken out of the passing game has affected his drive in this area) and the RB blocking has been much worse.